Fix (minor) typos in normalizing_flows_in_pytensor notebook

[theorashid]

Description

Enjoyed reading this. Some very minor types

Related Issue

• Closes #
• Related to Normalizing Flows in PyTensor Notebook #1588

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pytensor--1611.org.readthedocs.build/en/1611/

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[jessegrabowski]

Thanks for this!

[ricardoV94]

Makes me wonder what major typos look like